Pole derrick



Sept. 23, 1952 H. J. TROCHE ET AL 2,611,580

, POLE DERRiCK Filed Sept. 15, 1949 5 Sn'et' snee't 1 INVENTORS. HERMAN JZ mac/ls ZMES HOWARD HaLA/v A TTORN Y S pt. 23, 1952 H. J. TRQcHE-l 251L580.

POLE DERRICK,

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Patented Sept. 23, 1952 POLE DERRICK Herman J. Troche, Fairview Village, and James Howard Holan, Rocky River, Ohio, assignors to J. H. Holan Corporation, Cleveland, Ohio, a corporation of Ohio Application September 13, 1949, Serial No. 115,420

4 Claims.

The invention relates to derricks, and particularly to adjustable boom types of derricks mounted on and operated from utility truck bodies and utilized primarily for erecting and servicing the poles of public utility lines such as power, telephone, and telegraph lines.

The objects of the invention are to provide equipment of the character stated which may be conveniently transported on the truck body, which is conveniently raised, adjusted, and lowered without necessarily imposing heavy work on the line workmen, and which provides a wide working angle within which the necessary operations may be carried out.

Also, certain structural improvements forming part of the invention provide automatic locks for the derrick legs in certain positions.

The annexed drawings and the following description set forth in detail certain means illustrating the improvements in pole derricks, such means constituting, however, only one of the various forms in which the principle of the invention may be embodied.

In said annexed drawings:

Figure 1 is a fragmentary side elevation of a utility truck, partially broken away, upon the top of the body of which the improved pole derrick is mounted for transporting, there being shown in dot-and-dash lines an extended position of one of certain telescoping parts of the legs, certain boom and load lines and control means for the operation thereof being also indicated;

Figure 2 is a rear elevation of the elements shown in Figure 1, there also being shown in dot-and-dash lines a shifted position of an aux-.

iliary derrick leg or brace which in this position has been pivotally shifted from its transporting position to a position preliminary to erection of the derrick;

Figure 3 is a side elevation which shows the derrick erected to a vertical position;

Figure 4 is a rear elevation of the elements as shown in Figure 3;

Figure 5 is a view similar to Figure 3 but showing the pole derrick in operating position at a considerable working angle from the vertical plane of the rear of the truck body, automatic locks for securing the derrick legs in vertical position to a fulcrum bar being shown in open position;

Figure 6 is a rear elevation of the elements as shown in Figure 5;

Figure '7 is an elevation, upon an enlarged scale, looking toward the rear of the truck body, of a fragmentary portion of a fulcrum bar and an automatic lock thereto for a swivel bracket mounted upon the main derrick leg, there being however one of these swivel brackets with its automatic lock on each of the derrick main and auxiliary legs;

Figure 8 is a fragmentary longitudinal vertical section, upon a still larger scale than that of Figure '7, and taken in the plane indicated by the line 8-'-8, Fig. 7, open positions of the automatic lock parts being also shown in dot-anddash outline;

Figure 9 is a side elevation, upon an increased scale, of the rear of the truck'body and the derrick legs in vertical position;

Figure 10 is a rear elevation of the elements as shown in Figure 9, both of Figures 9 and 10 showing a lock for pivotally securing telescoping sections of the main and auxiliary legs to the truck body; and

Figure 11 is a fragmentary vertical longitudinal section, upon an enlarged scale, taken in the plane indicated by the line I [-1 I, Figure 10, and more clearly showing the lock for the telescoping sections of the legs.

Referring to the annexed drawings in which the same elements are illustrated by the same respective numbers in the several views, the improved pole derrick is designed for mounting on, transporting by, and operative from a truck body I. The derrick has only two legs, a main leg 2,

and a secondary leg or brace 3 pivoted at one end in bracket 3 to and adjacent one end of the main leg 2.

When the derrick is being transported, it is carried on top of the truck body I in the position illustrated in Figure 1 with the secondary leg or brace 3 pulled over adjacent the main leg 2 as shown in full lines in Figure 2. The legs 2 and 3 in this closely adjacent position for transporting purposes are clamped or fastened together many suitable manner. Preliminary to erecting the derrick the legs 2 and 3 are unclamped and the leg 3 moved over upon its upper pivotal axis into the position shown in dot-anddash lines in Figure 2.

The erection, lowering, and operation of the derrick is controlled from a power driven winch 4 equipped with a double drum structure con sisting of a fixed drum 5 servicing the boom line I and a shorter rotatable drum & servicing the load line l2. The boom line 1 is threaded from the drum 5 through a guide roller unit 8 to a connector 9 which forms one end of the head connection line H] fastened at its opposite end to the head ll of the main leg 2. The load line I2 is threaded from the drum 6 over a sheave 13 mounted on a telescoping extension 14 of the main leg 2 and thence is threaded over a sheave 15 mounted in the head H of the main leg 2 and depends therefrom. The free end of the load line [2 is provided with an eye It by which, when necessary, it can be attached to a safety hook ll secured to a swivel bracket 2| mounted on the main leg 2. There is also a telescoping extension I8 for the brace 3. I4 and it are pivotally secured to the body I when the derrick is in vertical position or in any operating position, as shown in. Figures. 5 and 9,. by means which will be hereinafter described and are particularly shown in Figures 9, 10, and 11. The telescoping extensions M and is are pulled out when the derrick legs are in the expanded condition illustrated by dot-and-dash lines in Figure 2 and this extension of the telescoping parts l4 and I8 is effected by removing pins 23 shown in Figure l and then replacing these pins 23 after the telescoping parts hi and it: have been pulled out.

A fulcrum bar 29 is provided which isremovabl-y secured adjacent its ends by pins 26 (Figure to side members of the much i and extends across the rear of the. truck body and forms a fulcrum over which the derrick may be moved when-being erected or lowered. When the derrick is being transported the fulcrum. bar 26 can be removed so as to provide space within the truck body for tall transformers, cable reels, or other large elements forming necessary parts or" the. operating equipment and line accessories.

The aforementioned swivel bracket for the main leg 2 is indicated by the character 2t and alike element for the brace 3 is indicated by the character 22.. These swivel brackets 22! and 22 serve to secure the legs 2 and 3 to the fulcrum These swivelbrackets- 2 land 22 are provided with locks which are automatically closed, as hereinafter described in detail, when the; derrick is moved from the position shown in Figur 5 to the position shown in Figure 9 and areal-so locked whenever the derrick is being erected to vertical position from transporting position or lowered from vertical position to transporting position.

The derrick is raised. by the following procedure:

First, the side. brace. 3 is unclamped from the main leg 2 and its lower end swung over into the position shown in dotand-dash lines in Figure 2 and the swivel bracket 22 therefor locked tothe fulcrum bar 20. The swivel bracket ti on the ma leg 2 is already locked to the fulcrum. bar 23.

Then the pins 2.3 which engage registering holes the leg extensions 5d and i 8 and the legs 2 and respectively, are removed and the telescoping extensions M- and it pulled out, as shown in dot-an-rl-dash lines, Figure l,- and the 23 replaced.

Then the boom line. i is rigged from the fixed drum ii through the guide roller unit 8; to the connector 9 forming the end partofthe headconnecticn line it, as shownin Figure 3.

Then, with the derrick controlled by the boom line i, the. small drum 6' is operated and. theload line 52 swings the connected legs 2 and 3 on the fulcrum bar 29 and raises the derrick to the position shown in Figure. 3 at the end of which movement the locking devices at the bottom ends of the leg extensions i4 and is are manipulated to secure the bottoms of the'extensions pivetally to the base of the truck body.

The leg extensions:

Then the slack is taken up on the boom line '5 by means of the drum 5 and the locks on the swivel brackets 2i and 22 which secure the legs 2 and 3 to the fulcrum bar 26 are manually unlocked and the derrick lowered as desired by the boom line i.

The derrick is now in operating position, one of which positions is illustrated in Figure 5 and 6.

To lower the derrick, the latter is pulled in by the boom line i so that the swivel brackets 2| and Z2 engage the fulcrum bar 28 and thus the legs 2 and 3 are automatically locked to the fulcrum bar. 29.

Then the eyeletend B6 of the load line 12 is fastened to the safety hook ll on the main leg 2, and the slack of the load line I2 is checked to an extent to hold. the derrick as it tends to swing forwardly over the fulcrum bar 29.

Then the looks at the bottom of the leg extensions Hi and I8 are manually unlocked and the derrick is pulled over the fulcrum bar 28 by the boom line I andthcn is. lowered into transporting position ontop of the truck. body 5 by means of a controlled. paying out of. the load line it. The extensions -4- and 18 are then. telescoped into the respective legs 2 and 3' and lockedby the pins 23. Then the brace 3 is swung over and. clamped to the leg 2.

The swivel brackets 21 and 22 which are. automatically but removably clanipable to-the fulcrum, bar 29 are each formed. with az-forwardlyextended: U--shaped member having a web 26 and an extended part 25, Figure. 5; com-prised of. side flanges 2?, Figures '7 and 8., having front edge formations providing recesses 23 for the. accommodation of the fulcrum bar 253... Formed. en the. inside walls of the side membersZ-l are rectangular shoulders 29 which are intersected by a pin 35] mounted at its ends in the side members 27. The pin 30 is prevented from displacement by the set screw 3! mounted in one of the. shoulders. 2H. A web member 32 of the. U-shaped part 25 is formed with a hole 32 which, in. a certain position of the body 34 of a certain movable. clamp is. in alignment with a recess 3' i formed in said body 3 5, for instance, the full line position shown in Figure e. The clamp: is anintegral member. having an and, jaw 3.5. and an arm 35 and is pivotally mounted on the pin 30.. When the hole 32 and recess 3& of the web member 32 and the clamp body 34 respectively are in alignment,.a spring pressed'plunger 37 mounted in a. housing, 38 passes through the hole 32 and into the recess 34 and locks the clamp body 34.. The housing 33 depends from the web 32 of the U-shaped part 25. The plunger 37 can. be withdrawn from the recess 34 against. the compression of the spring by means of the finger ring 39.

When the swivel brackets 2! and 22 are not clamped to the fulcrum bar 28, as indicated in Figure 5, i... e.,, when the pole derrick is being utilized outwardly of the. vertical plane indicated by Figure 3, the clamp is in openposition illustrated in dot-and-dash. lines. in Figure 8. However, as the pole derrick legs 2. and. 3 move forwardly toward the vertical position shown in Figure 3 the arm 3.8 encounters the fulcrum bar 20 and is pivot-ally moved on the. pin as to the position shown in full lines in Figure 8 when. it will be noted the jaw 35 has been moved to clamping engagement with the fulcrum bar 20. During this movement the curved surface. 48 of the clamp body 34 rolls on top of the web. 32 of the U-shaped clamp part .25. This movement of the clamp body 34 of which the jaw 313 is a part moves the recess 34 in the body 34 into registration with the hole 32 of the web member 32 so is desired to operate the derrick rearwardly of the vertical position shown in Figures 3 and 9.

The means for pivotally securing the leg extensions l4 and I8 to the truck body comprises a bracket for each of the extensions i l and i8 having two spaced plates 42 projected rearwardly from the bottom of the truck body I, to the outer face of one of each of which pairs of plates is secured a keeper 5!) which extends at its rear end over a circular hole 39 formed in the plate 42. Each of the pairs of plates Q2 has aligned holes it and rotatably mounted in one of the holes :9 of each of the pairs of plates 42 is a truncated cylindrical member of the formation clearly shown in full lines in Figure 11, having a plane side'fil. To this cylindrical member is secured a pin 4! intersecting the aligned holes 49 and having an angular finger end portion M Whenever the cylindrical member is in the positioncylindrical member and both sides of the extension l4 or extension 18 from being misplaced. This is the operating position whereby the derrick can be pivotally moved forwardly or rearwardly upon the lower part of the trunk body 1. However, when the operating end M of the pin 4| is turned in the dot-and-dash position shown in Figure 11, the truncated part 5| of the cylindrical member is turned to a position adjacent the kee er 5;} so that the pins 4| can bewithdrawn from the extensions 14 and I8 and the extensions thus permitted to swing in between the plates 42 or outwardly therefrom depending upon whether the extensions [4 and [8 are being coupled up or loosened.

For ground sup ort of the truck body I adjacently beneath the pole derrick there are provided two jacks 48 each comprising telescoping sections, the jacks 46 being hinged on pivot pins 41 adjacently below the truck body i. When the pole derrick is being transported, the jacks 46 are fastened in upper position adjacently below the truck body I by chains 48, Figure 1.

What we claim is:

1. In a device of the character described, the combination with a vehicle body having rearwardly projecting ears and pintles removably mounted therein, of derrick legs apertured to receive the removable pintles for pivotal support from the body, said legs being provided above said pintles with a pivotally mounted clamp having spaced fingers, a pivot bar mountable upon said body and receivable between said fingers when said legs are in upright position to register the fingers with thepivot bar, one of the fingers being enga eable with the pivot bar upon approaching the latter pivotally to swin the clamp to cause the other finger to engage the bar in a locking position, and a keeper for retaining the finger in locking position with the bar, the bar and fingers providing fulcrum means for erection and dismantling of the derrick legs.

2. The combination with a vehicle body comprising a bed and side walls, of bracket fittings connected with the side walls near the rear of the latter, a substantially horizontal bar mountable on said bracket fittings, a derrick having intermediate its height a bracket pivotally mounted thereon and formed with spaced projecting fingers between which the bar is receivable, said bracket being pivotally moved upon engagement of one of the fingers with the bar to clamp the opposed finger in locking position about the bar, and removable keeper means automatically actuated to retain the finger in locking position on the bar, and means for holding the lower end of the derrick in detachable pivotal connection with the vehicle body.

3. A derrick, adapted for operation from a truck body, having two relatively adjustable connected legs adapted to rest on the body in juxtaposed position, a fulcrum bar removably mounted upon the truck body and over which the connected legs are tiltable, means for pivotally and removably securing the legs to the truck body below the bar,

means forremovably securing the legs to the bar for tilting movement thereover including jaws pivotally mounted upon the respective legs and movable into engaging position with the fulcrum bar upon contact with the latter, and automatically-actuated means for holding the jaws in engaging position, a drum in the truck body and a boom line tracking thereover, the line being secured to the legs above the fulcrum bar, a second drum in the truck body and a load line tracking thereover, means for operating the drums, and sheaves over which the load line traverses mounted on one of said legs above and below the fulcrum bar. a

4. A derrick, for use upon a support, the der-. rick having a main leg, a bracing leg secured adjacent its upper end to the upper end of the main leg and diverging therefrom toward its opposite end, releasable means for pivotally securing the lower ends of the legs to the support, a fulcrum bar mounted on the support intermediate the ends of the legs, automatically clamping means mounted on the legs for securing intermediate parts of the respective legs to the fulcrum bar for swinging movement thereover including pivotally-mounted jaws engaged by the fulcrum bar and movable into engaging position with the fulcrum bar upon contact with the latter, automatically-actuated means for holding the jaws in engaging position, the derrick hav ing a boom line connected thereto and sheaves mounted thereon above and below said automatically clamping means, a load line traversing the sheaves, and a winch including drums mounted on the support for the boom and load lines.

HERMAN J. 'I'R'OCHE. JAMES HOWARD HOLAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

